title: A multivariate analysis of red blood cell membrane transports and plasma levels of L-tyrosine and L-tryptophan in depressed patients before treatment and after clinical improvement.
abstract: The purpose of this study was to examine whether biological variables, such as erythrocyte membrane transports and plasma levels of monoamine precursor amino acids (tyrosine, tryptophan and phenylalanine), exhibit a particular pattern relatively to DSM-III depressive subgroups (dysthymic disorders, major recurrent depression and biopolar depression), when they are treated synthetically by a stepwise discriminant analysis. We conducted two tests in 97 subjects (64 depressed patients vs. 33 controls): the first before any antidepressant treatment, and the second after pharmacotherapy and clinical improvement. Our results clearly indicate a satisfying homogeneity for the controls and bipolar depressed patients as opposed to dysthymic disorders and major recurrent depression in both tests. The most informative biological variables are the erythrocyte membrane transports before treatment, tryptophan parameters after clinical improvement. Evidence is provided that multivariate analysis constitutes an interesting approach in biological psychiatry.
authors.affiliation: Department of Psychiatry, Research and Care Unit, Geneva, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Chiaroni
authors.forename: J M
authors.initials: JM
authors.lastname: Azorin
authors.forename: P
authors.initials: P
authors.lastname: Bovier
authors.forename: J
authors.initials: J
authors.lastname: Widmer
authors.forename: R
authors.initials: R
authors.lastname: Jeanningros
authors.forename: A
authors.initials: A
authors.lastname: Barré
authors.forename: H
authors.initials: H
authors.lastname: Dufour
authors.forename: A
authors.initials: A
authors.lastname: Tatossian
authors.forename: R
authors.initials: R
authors.lastname: Tissot
mesh_terms: D000328:Adult; D001714:Bipolar Disorder / Q000097:blood* / Q000188:drug therapy / Q000523:psychology; D003866:Depressive Disorder / Q000097:blood* / Q000188:drug therapy / Q000523:psychology; D004910:Erythrocyte Membrane / Q000378:metabolism*; D005260:Female; D005500:Follow-Up Studies; D006760:Hospitalization; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D010649:Phenylalanine / Q000097:blood*; D011569:Psychiatric Status Rating Scales; D014364:Tryptophan / Q000097:blood*; D014443:Tyrosine / Q000097:blood*
chemical_list: D014443:Tyrosine; D010649:Phenylalanine; D014364:Tryptophan